include/exec/tb-hash.h

   1 /*
   2  * internal execution defines for qemu
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef EXEC_TB_HASH
  21 #define EXEC_TB_HASH
  22
  23 /* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
  24    addresses on the same page.  The top bits are the same.  This allows
  25    TLB invalidation to quickly clear a subset of the hash table.  */
  26 #define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
  27 #define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
  28 #define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
  29 #define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
  30
  31 static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)
  32 {
  33     target_ulong tmp;
  34     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  35     return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;
  36 }
  37
  38 static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)
  39 {
  40     target_ulong tmp;
  41     tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));
  42     return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)
  43            | (tmp & TB_JMP_ADDR_MASK));
  44 }
  45
  46 static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)
  47 {
  48     return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);
  49 }
  50
  51 #endif